For a new blog, the easiest way to do keyword research is to look for keywords with 30-70 monthly searches.
Yes you read it right.
If you focus on keywords with this search volume, you'll more often find easy to rank opportunities.
Also, check whether the top 10 results are DR70+ websites or not. If more than 8 of the top 10 results are from DR70+ websites, I would ignore that keyword.
In my experience, every time I've focused on keywords with 30-70 monthly searches, completed a topical cluster, and published 5-6 articles covering that cluster (with around 20 articles already on my website), I've managed to get some rankings and traffic from Google.
Remember, not many people target keywords with such low search volumes. All that matters for a new website is getting that first boost of traffic.
Once Google starts trusting your website, you can move on to keywords with higher search volumes.
Another benefit of targeting keywords with 30-70 monthly searches is that you're usually targeting long-tail keywords. Once your website starts ranking for a few long-tail keywords, it may also begin ranking for some mid volume keywords naturally.
Hope this helps!